Section 2: Individual LEED Credit Reviews
LEED Credit SS-8:
Designing exterior lighting for parking lots and
parking garages (where applicable) based on
Light Pollution Reduction
the minimum illumination levels and uniformity
ratios specified in IESNA RFP2098
Designing exterior lighting for on-site
roadways (where applicable) based on the
Intent
Eliminate light trespass from the building site,
ratios as specified in IESNA RP800
improve night sky access, and reduce
Selecting and specifying shielded and full
development impact on nocturnal environments.
cutoff exterior luminaires for all or most of the
site, building, and landscape lighting
Requirements
Carefully selecting site lighting fixtures for use
at property boundaries
Meet or provide lower light levels and uniformity
Checking interior lighting layouts at spaces
ratios than those recommended by the
along the building perimeter to ensure that
Illumination Engineering Society of North
luminaires are not directing most of their light
America (IESNA) Recommended Practice Manual;
out of windows
Lighting for Exterior Environments (RFP-33-99).
Design exterior lighting such that all exterior
The specific lighting targets need to be placed in
luminaires with more than 1000 initial lamp
the context of an overall exterior lighting approach
lumens are shielded and all luminaires with more
that balances security, aesthetic, and functional
than 3500 initial lamp lumens meet the full
considerations.
Cutoff IESNA Classification. The maximum
candela value of all interior lighting shall fall
Basis for Cost Assumption
within the building (not out through windows)
and the maximum candela value of all exterior
The design and fixture selection issues required for
lighting shall fall within the property boundary
this credit are not expected to impact construction
shall have shielding such that no light from that
costs. Shielded and full cutoff exterior luminaires
luminaire crosses the property boundary.
are already commonly used in GSA projects. In
addition, GSA's P100 notes that lighting levels for
(1 point)
exterior spaces should be based on IES values.
It is acknowledged, however, that security-driven
Cost Impact = 2
lighting requirements could limit the applicability
of this credit. On some sites, illumination levels
might be set above the minimums defined in the
1
2
3
4
5
IESNA guidelines in order to match local or
project-specific criteria. Because it cannot be
GSA
No
Low
Moderate
High
assumed that all GSA projects will meet the credit
Mandate
premium,
premium
premium
premium
(50-150K)
(>150K)
(no cost)
psble svgs
(<50K)
requirements, this credit is assumed to be earned in
only half of the Courthouse scenarios. The credit is
Practical Applications
included in the "low cost" Courthouse cases but
not in the "high cost" cases.
Achieving this credit will typically require a
For the purposes of this study, the credit was not
combination of the following strategies:
included in any of the Office Building models--the
Designing exterior lighting for plazas and
scope of the Office building modernization does
sidewalks based on the minimum illumination
not include site work.
levels and uniformity ratios specified in
IESNA RFP3399 (the standard also
specifies lighting levels for the floodlighting of
buildings and monuments)
GSA LEED COST STUDY
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